Updated April 2026

Solar Battery Storage Guide 2026

Battery storage transforms a good solar investment into a great one. Store surplus energy, eliminate export at low rates, and keep your lights on during power cuts.

£2,500–£10k

Battery system cost

0% VAT

On all home batteries

10 Years

Standard warranty

90%+

Self-consumption rate with battery

Why Add Battery Storage to Solar?

A solar panel system without battery storage exports surplus electricity to the grid at low SEG rates (typically 3–15p/kWh) and then buys electricity back in the evening at full retail price (24–28p/kWh). A battery closes this gap by storing your own solar electricity for use when the sun is not shining.

With a battery, a typical 4kW solar system with 9.6kWh storage can achieve 80–90% self-sufficiency throughout summer months, dramatically reducing grid imports. The additional cost of a battery is typically recovered in 5–7 years through avoided import costs.

Solar Without Battery

  • ✗ Surplus exported at 3–15p/kWh
  • ✗ Evening power purchased at 24–28p/kWh
  • ✗ Self-consumption: 30–50%
  • ✓ Lower upfront cost

Solar With Battery

  • ✓ Surplus stored for evening use
  • ✓ Very little evening grid import
  • ✓ Self-consumption: 80–90%
  • ✓ Backup power in outages (some models)

Battery Comparison 2026

All prices include installation and 0% VAT. Supplied and installed by Midland Solar.

BatteryCapacityInstalled Price
GivEnergy All-in-One9.5kWh£3,800–£4,800
Tesla Powerwall 313.5kWh£8,500–£10,000
Fox ESS ECS29009.6kWh£3,200–£4,200
SIG Energy10kWh£3,500–£4,500
Solis RHI-3PUp to 20kWh£5,000–£8,000

How to Choose the Right Battery Size

1–2 people

Daily usage: 6–8 kWh/day

Recommended battery: 5–9.6 kWh

Ideal solar: 3–4 kW

3–4 people

Daily usage: 10–14 kWh/day

Recommended battery: 9.6–14.4 kWh

Ideal solar: 4–6 kW

5+ people

Daily usage: 15–20+ kWh/day

Recommended battery: 14.4–20 kWh

Ideal solar: 6–10 kW

Frequently Asked Questions

Free Estimate Tool

How much could you save?

Average saving: £800–£1,400/yrTakes under 2 minutes

Get a Battery Storage Quote

Whether you are installing solar and battery together, or retrofitting to an existing system, our team can recommend the right solution and provide a free no-obligation quote.